9e673853e5
This requires all AnimationController objects to be given a TickerProvider, a class that can create the Ticker. It also provides some nice mixins for people who want to have their State provide a TickerProvider. And a schedulerTickerProvider for those cases where you just want to see your battery burn. Also, we now enforce destruction order for elements.
110 lines
3.3 KiB
Dart
110 lines
3.3 KiB
Dart
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter/material.dart';
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class ProgressIndicatorDemo extends StatefulWidget {
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static const String routeName = '/progress-indicator';
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@override
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_ProgressIndicatorDemoState createState() => new _ProgressIndicatorDemoState();
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}
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class _ProgressIndicatorDemoState extends State<ProgressIndicatorDemo> with SingleTickerProviderStateMixin {
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AnimationController _controller;
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Animation<double> _animation;
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@override
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void initState() {
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super.initState();
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_controller = new AnimationController(
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duration: const Duration(milliseconds: 1500),
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vsync: this,
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)..forward();
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_animation = new CurvedAnimation(
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parent: _controller,
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curve: new Interval(0.0, 0.9, curve: Curves.fastOutSlowIn),
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reverseCurve: Curves.fastOutSlowIn
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)..addStatusListener((AnimationStatus status) {
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if (status == AnimationStatus.dismissed)
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_controller.forward();
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else if (status == AnimationStatus.completed)
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_controller.reverse();
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});
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}
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@override
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void dispose() {
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_controller.stop();
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super.dispose();
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}
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void _handleTap() {
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setState(() {
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// valueAnimation.isAnimating is part of our build state
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if (_controller.isAnimating) {
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_controller.stop();
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} else {
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switch (_controller.status) {
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case AnimationStatus.dismissed:
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case AnimationStatus.forward:
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_controller.forward();
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break;
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case AnimationStatus.reverse:
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case AnimationStatus.completed:
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_controller.reverse();
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break;
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}
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}
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});
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}
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Widget _buildIndicators(BuildContext context, Widget child) {
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List<Widget> indicators = <Widget>[
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new SizedBox(
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width: 200.0,
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child: new LinearProgressIndicator()
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),
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new LinearProgressIndicator(),
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new LinearProgressIndicator(),
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new LinearProgressIndicator(value: _animation.value),
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new CircularProgressIndicator(),
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new SizedBox(
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width: 20.0,
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height: 20.0,
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child: new CircularProgressIndicator(value: _animation.value)
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),
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new Text('${(_animation.value * 100.0).toStringAsFixed(1)}%${ _controller.isAnimating ? "" : " (paused)" }')
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];
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return new Column(
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children: indicators
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.map((Widget c) => new Container(child: c, margin: const EdgeInsets.symmetric(vertical: 15.0, horizontal: 20.0)))
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.toList(),
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mainAxisAlignment: MainAxisAlignment.center
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);
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}
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@override
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Widget build(BuildContext context) {
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return new Scaffold(
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appBar: new AppBar(title: new Text('Progress indicators')),
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body: new DefaultTextStyle(
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style: Theme.of(context).textTheme.title,
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child: new GestureDetector(
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onTap: _handleTap,
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behavior: HitTestBehavior.opaque,
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child: new Container(
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padding: const EdgeInsets.symmetric(vertical: 12.0, horizontal: 8.0),
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child: new AnimatedBuilder(
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animation: _animation,
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builder: _buildIndicators
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)
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)
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)
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)
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);
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}
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}
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